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    <p>Why are you using <code>display: table-row;</code> declarations ? There is no need for this. Remove the <code>display: table-row;</code> declarations, add a <code>box-sizing: border-box;</code> declaration to your textarea selector and you're all set :</p> <pre><code>.container { height: 220px; width: 220px; background-color: pink; } .container &gt; textarea { width: 100%; height: 100%; background-color: cyan; box-sizing: border-box; } .container &gt; div { width: 100%; height: 100%; background-color: cyan; } </code></pre> <p><a href="http://jsfiddle.net/b4Tt8/10/" rel="nofollow">Fiddle</a></p> <p>EDIT :</p> <p>The CSS above makes the text area overflowing its parent div.</p> <p>Here is an updated answer :</p> <h2>HTML</h2> <pre><code>&lt;div class="container"&gt; &lt;div class="button-wrapper"&gt; &lt;button&gt;X&lt;/button&gt; &lt;/div&gt; &lt;div class="textarea-wrapper"&gt; &lt;textarea&gt;&lt;/textarea&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <h2>CSS 2</h2> <pre><code>.container { height: 220px; width: 220px; background-color: pink; position: absolute; } .container textarea { width: 100%; height: 100%; background-color: rgba(255, 255, 0, 0.5); box-sizing: border-box; } .container &gt; div { background-color: cyan; } .container .button-wrapper { background-color: yellow; height: 26px; } .container .textarea-wrapper { background-color: green; position: absolute; top: 26px; width: 100%; bottom: 0; } </code></pre> <h2>CSS 3 (using calc function)</h2> <pre><code>.container { height: 220px; width: 220px; background-color: pink; } .container textarea { width: 100%; height: 100%; background-color: rgba(255, 255, 0, 0.5); box-sizing: border-box; } .container &gt; div { background-color: cyan; } .container .button-wrapper { background-color: yellow; height: 26px; } .container .textarea-wrapper { background-color: green; height: calc(100% - 26px); } </code></pre> <p>Here are fiddles that shows both solutions :</p> <p><a href="http://jsfiddle.net/pjprp/" rel="nofollow">CSS 2</a></p> <p><a href="http://jsfiddle.net/6M8nZ/1/" rel="nofollow">CSS 3</a></p>
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